What are the reasons for the poor repeatability of the results of the moisture analyzer? How to impr

Elite (Beijing) specializes in analyzing the repeatability of the measurement results of the moisture analyzer for you.

Causes of poor and improvement measures:

1. The sample is uneven, that is, the sample has different components. The more uneven the sample, the larger the sample volume will be needed to obtain very reproducible test results;

2. When the selected drying time is too short (to "timed shutdown.

mode). Extend the drying time or choose a suitable "weightlessness per unit time" shutdown mode;

3. The sample is not completely dried out (forming crusts). Samples are dried with the help of fiberglass discs;

4. The drying temperature is too high, and the sample has been oxidized. Lower drying temperature;

5. The sample boils and continuously splashes outward, which changes the quality. Lower drying temperature;

6. Halogen lamp.

The protective glass is contaminated and the heating capacity is insufficient. The protective glass of the halogen lamp needs to be cleaned;

7. Temperature sensor.

Contaminated or faulty. Clean the temperature sensor or have it replaced by a professional service engineer;

8. When the support of the instrument is unstable. Adopt stable bearings;

9. The surrounding environment is very unstable (vibration, etc.), adjust the environmental conditions.

There are many reasons for the poor reproducibility of the moisture analyzer results, such as:

1. The accuracy of the moisture analyzer: because the accuracy determines the error of the data;

2. Environmental problems: the environmental temperature and humidity of some enterprises vary greatly;

3. Use scenario: Some enterprises are on the production line, and the production line has air convection or vibration;

4. Sample processing: Samples in some industries need to be processed;

5. Sample storage: Samples should be stored in sample boxes, especially samples with low moisture, which is very important;

6. Operation method: the operation proficiency of the equipment is also a very critical factor.

The above links may cause errors in the data of the moisture analyzer, and the specific problems should be solved according to the actual situation.

In the process of using the moisture analyzer, the problem of moisture detection error is generally involved, which is mainly reflected in the accuracy and repeatability. So what's the difference between them?

Accuracy error: the national grain and oilseed moisture testing standard GB T5497-85 has made a clear provision for the moisture analyzer: the moisture analyzer with the comparison error of the oven is not more than qualified, which requires the instrument to test the sample moisture and the actual moisture value deviation can not exceed, which is the accuracy error.

Repeatability error: GB T5497-85 grain and oil testing standard also has a provision for the oven: the allowable difference of the double test results does not exceed the average number, which is the measurement result.

The result is taken to the first decimal place. The simple understanding is that the subtraction of the moisture value of the two samples cannot be greater than, and the repeatability error is also true for the moisture analyzer, and the subtraction of the value of the same sample test twice is the repeatability error.

In a word, the accuracy error is compared with the actual moisture content of the sample, and the repeatability error is the comparison of the repeatability of the moisture meter detection. Therefore, when purchasing a moisture analyzer, it is necessary to take into account the accuracy error and repeatability error, and a good moisture analyzer can not only detect accurately, but also have good repeatability.

1. The influence of strong electromagnetic interference sources.

Today's digital level is composed of many electronic components, which will physically react with the electromagnetic field in a strong electromagnetic environment and have an impact on the measurement data.

Solution: During the usual measurement, avoid the strong electromagnetic field of the horizontal line as much as possible.

Second, the impact of vibration.

When the ground shakes, the barcode ruler and alignment of the level are extremely unstable. As a result, the instrument shakes up and down when the barcode ruler is imaging, resulting in inaccurate measurement information and data.

Solution: The area where the level is measured should have a high degree of stability, and ensure the stability of the ruler and the measuring station, and the measurement work should be started only after the settlement is stable.

3. The influence of the electron i angle.

Some surveyors find that there is a stored electronic I angle when the level is sent for inspection, and the reason is that some surveyors will not use or are not sure about the specifications of the first and second class level measurements, and update the electronic I angle test.

Workaround:1Set up two A and B rulers at a distance of 45 cm in a place where there is no strong electromagnetic field interference and no vibration source

2.Set up the instrument station 15 cm away from the two rulers.

3.The measuring station and ruler A and B are observed separately, and the electronic I angle is automatically updated by the level.

The repeatability errors caused by the rapid moisture analyzer when measuring the sample are as follows: 1The sample is not homogeneous.

2.The drying time chosen is too short. Extend the drying time or select the appropriate closing mode "weight loss per unit time".

A: 3The sample is not completely dry A:

For example: due to superficial crusting). Try mixing quartz sand for drying.

4.The temperature chosen is too high or the sample is oxidized. A:

Reduce the drying temperature by 5The sample boils and splashes constantly, changing the temperature. A:

Please choose a reasonable mode and clean the cover glass 6When the protective glass is fouled, the heating amount cannot be fully utilized, A: Please clean the protective glass.

7.The temperature sensor is contaminated or damaged. A:

Please clean the temperature sensor.

8.The worktop is not stable. A: Please apply a stable operator's station.

9.The external environment is unstable (excessive air flow, vibration, etc.).

The reasons for the error can generally be divided into the following types: 1. The accuracy of the selected moisture meter. 2. The type of moisture meter selected.

3. The performance of the sample tested. 4. Experimental environment. 5. Operation methods, etc., Guanya Moisture Meter Technical Service Center 0755-26553866